Coordinate Measuring Probe Temperature Compensation With Low-Pass Filtering
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Solution Overview
Problem
Existing measuring apparatuses face challenges in performing accurate temperature compensation due to the delay in heat propagation and temperature stabilization in electrical components, leading to inconsistencies in dimensional changes, which affect measurement precision and require additional temperature sensors, increasing complexity and cost.
Innovation Solution
Incorporating a temperature sensor for the electrical section and applying a low-pass filter to the detection signal to calculate a compensated measurement result, ensuring the measurement value aligns with actual dimensional changes, thereby simplifying the apparatus configuration and reducing the need for multiple sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a temperature sensor is provided for the electrical section to measure temperature immediately, then temperature measurement responsiveness is improved, but the measured temperature does not reflect actual thermal expansion of the measurement performing unit due to delayed heat propagation
Solution Approach 1:
The patent applies preliminary action by measuring the temperature of the electrical section (which heats up first) and using this early temperature data to predict or calculate the subsequent thermal expansion of the measurement performing unit. The temperature sensor is strategically placed in the electrical section to capture temperature changes before they propagate to the measurement scale, enabling proactive compensation rather than reactive measurement.
2Measurement precision
If multiple temperature sensors are provided for different parts of the measurement performing unit, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent segments the thermal analysis into two distinct parts: (1) temperature measurement in the electrical section using a single sensor, and (2) thermal expansion calculation for the measurement performing unit using predetermined thermal characteristics. This segmentation allows the system to use one temperature sensor effectively by separating the measurement function from the compensation calculation function.
Solution Approach 2:
The patent introduces predetermined thermal characteristics (thermal expansion coefficients, heat propagation models) as an intermediary between the temperature sensor and the compensation mechanism. This intermediary layer allows a single temperature measurement to be transformed into accurate compensation data without requiring multiple physical sensors throughout the system.
3Measurement precision
If waiting for temperature saturation before compensation is performed, then measurement precision is improved, but productivity decreases due to extended waiting time
Solution Approach 1:
The system performs preliminary temperature measurement in the electrical section and uses predetermined thermal characteristics to calculate expected thermal expansion at any given time. This allows the compensation value to be determined immediately without waiting for thermal saturation, as the system can predict the thermal state based on the early temperature readings and known thermal properties.
Solution Approach 2:
The patent changes the parameter being measured from the final thermal equilibrium temperature to the instantaneous temperature of the electrical section, combined with time-based thermal modeling. By measuring temperature earlier in the thermal process and using time as an additional parameter in the compensation calculation, the system eliminates the need to wait for thermal saturation while maintaining accuracy.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables immediate and accurate compensation for dimensional changes in the measuring apparatus, reducing measurement errors and simplifying the apparatus design by eliminating the need for separate low-pass filter circuits and minimizing interference with the measurement target.
Implementation Method 1
it is necessary to take into account a dimensional change in the measuring apparatus due to a temperature change, that is, a dimensional change caused by elongation of the measuring apparatus due to thermal expansion
Implementation Method 2
it takes a longer time for the heat to propagate with distance from the electrical section including the electrical component as the heat source
Data Source
AI summary
A coordinate measuring machine (measuring apparatus) includes: a probe (measurement performing unit) performing a measurement process on a measurement target; an electrical section disposed in a part of the probe; a temperature sensor provided for the electrical section and outputting a detection signal based on a temperature obtained by measurement; and a controller (measurement calculator) calculating a measurement result of the measurement target, in which the controller calculates the measurement result by compensating a measurement value obtained by the measurement process based on a processed signal obtained by applying a low-pass filter to the detection signal output from the temperature sensor.